Yup, talk to Justin or Bob. Bob said they were thinking of making black anodized ones, and larger diameter ones, and possibly some other variations for use with freehub spacers for different chain lines or chain widths. Yeah, they are $50, but I'm very happy with mine. I think if you use a cog meant to be used as a single gear though and not a cog with flat teeth off a cassette, your chain should stay on alright if you have a good chainline and the proper length chain for your axle/BB spacing or use a tensioning device. I used a Shimano BMX cog.